ie explorer have some question

  1. ch1035063420
    My app works perfectly in all other browsers but breaks in IE8-10 . The error from the debugger is:

    SCRIPT5007: Unable to get property 'headercontainer-1026-drag-status-proxy' of undefined or null referenceext-all.js (12785,17)

    copyright is Ext JS 4.2

    I created a test case

    Could anyone please suggest what is the issue?
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